Research
Security News
Quasar RAT Disguised as an npm Package for Detecting Vulnerabilities in Ethereum Smart Contracts
Socket researchers uncover a malicious npm package posing as a tool for detecting vulnerabilities in Etherium smart contracts.
Rust's syntax features for javascript.
These features will help our functional programming.
enum
struct
impl
trait
iter
panic
(not a macro)match
Result
Option
npm install --save rusted
These examples require es6 transpiler like Babel.
enum
import {Enum} from 'rusted';
//enum Message {
// Quit,
// ChangeColor(i32,i32,i32),
// Move {x:i32, y:i32},
// Write(String)
//}
let Message=Enum({
Quit:null, // no data
ChangeColor:Array, // accepts if data.constructor==Array
Move:'object', // accepts if typeof data=='object'
Write:'string' // accepts if typeof data=='string'
});
// with data
let x=Message.Move({x:3,y:4}); // let x: Message = Message::Move { x: 3, y: 4 };
// without data
let y=Message.Quit; // let y: Message = Message::Quit;
struct
struct
and enum
checks type of property when instantiate.
'any'
'number'
,'string'
,'object'
... (String)
typeof value_of_prop
Object
,Array
,Number
... (Constructor)
value_of_prop.constructor
import {struct} from 'rusted';
let Position=struct({
x:'number', // accepts if typeof x=="number"
y:'number' // accepts if typeof y=="number"
});
let Player=struct({
name:'string', // accepts if typeof name=="string"
position:Position, // accepts if position.constructor==Position
items:Array, // accepts if items.constructor==Array
memory:'any' // accepts any type
});
let player=Player({
name:'foo',
position:Position({
x:0,y:0
}),
items:[],
memory:{}
});
console.log(player.position.x); // > 0
impl
import {Enum,struct,match,impl} from 'rusted';
// For struct
let SomeStruct=struct({
x:'number',y:'number'
});
impl(SomeStruct,{
// You can define associated function (static method) by starting method name with "$".
$new(x,y){
return SomeStruct({x,y});
},
print(self){
console.log(`(${x},${y})`);
}
});
let some_struct=SomeStruct.new(2,3); // You don't need to attach "$" at first. "$" was removed at attaching proccess
some_struct.print(); // > (2,3)
// For enum
let SomeEnum=Enum({
Foo:null,
Bar:'number'
});
impl(SomeEnum,{
unwrap(self){
return match(self,{
Foo:()=>'Foo!',
Bar:x=>`Bar,${x}!`
});
}
});
let x=SomeEnum.Foo,y=SomeEnum.Bar(7);
console.log(x.unwrap()); // > Foo!
console.log(y.unwrap()); // > Bar,7!
// For ordinary constructor (javascript class)
let SomeConstructor=function(){
this.name='foo';
};
impl(SomeConstructor,{
create(){
return new SomeConstructor();
},
greet(self){
console.log(`Hello, ${self.name} !`);
}
});
let some_constructor=SomeConstructor.create();
some_constructor.greet(); // > Hello, foo !
trait
import {struct,trait,impl} from 'rusted';
let Foo=struct({
name:'string'
});
let BarTrait=trait({
print(self){}, // empty body, need to implement on `impl`
hello(self){ // has contents, not need to implement on `impl`
console.log('hello');
}
});
impl(BarTrait,Foo,{
print(self){
console.log(self.name);
}
});
/* This would be error
impl(BarTrait,Foo,{});
*/
let foo=Foo({name:'Taro'});
foo.print(); // > Taro
foo.hello(); // > hello
Option
import {Some,None,match} from 'rusted';
let divide=(numerator,denominator)=>{
return denominator==0
? None // represents there are no data
: Some(numerator/denominator);
};
let result = divide(2.0, 3.0);
match(result,{
Some:x=>console.log(`Result: ${x}`),
None:()=>console.log('Cannot divide by 0')
});
// > Result: 0.666...
Result
import {Ok,Err,match} from 'rusted';
function Foo(x){
if(x>5){
return Ok(x);
}else{
return Err('Less than 5 !');
}
}
console.log(match(Foo(3),{
Ok:x=>x,
Err:e=>e
}));
// > Less than 5 !
console.log(Foo(10).unwrap()); // > 10
console.log(Foo(3).unwrap()); // throws error
(es5 version.)
var rusted=require('rusted'),
Ok=rusted.Ok,
Err=rusted.Err,
match=rusted.match;
function Foo(x){
if(x>5){
return Ok(x);
}else{
return Err('Less than 5 !');
}
}
console.log(match(Foo(3),{
Ok:function(x){
return x;
},
Err:function(e){
return e;
}
}));
console.log(Foo(10).unwrap());
console.log(Foo(3).unwrap());
MIT
FAQs
Rust like enum, Result and Option for javascript
The npm package rusted receives a total of 2 weekly downloads. As such, rusted popularity was classified as not popular.
We found that rusted demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Research
Security News
Socket researchers uncover a malicious npm package posing as a tool for detecting vulnerabilities in Etherium smart contracts.
Security News
Research
A supply chain attack on Rspack's npm packages injected cryptomining malware, potentially impacting thousands of developers.
Research
Security News
Socket researchers discovered a malware campaign on npm delivering the Skuld infostealer via typosquatted packages, exposing sensitive data.